Add options to control min./max. data transfer amount.

[loba.git] / process.cpp

diff --git a/process.cpp b/process.cpp
index 470ad41bad93f4ee9b199d9ec1ffefb909228f0b..33a993ef5eb8e96041302b563acef1fafeb557b7 100644 (file)
--- a/process.cpp
+++ b/process.cpp
@@ -1,6 +1,7 @@
 #include <algorithm>
 #include <tr1/functional>
 #include <iterator>
+#include <numeric>
 #include <stdexcept>
 #include <sstream>
 #include <xbt/log.h>
@@ -127,12 +128,16 @@ void process::load_balance_loop()
             ++lb_iter;
         }
 
+        if (!opt::bookkeeping)
+            expected_load = real_load - get_sum_of_to_send();
+        // nothing to do with opt::bookkeeping
+
         if (opt::log_rate && lb_iter % opt::log_rate == 0) {
             XBT_INFO("(%u:%u) current load: %g", lb_iter, comp_iter, real_load);
             XBT_VERB("... expected load: %g", expected_load);
         }
 
-        if (get_load() > 0.0)
+        if (expected_load > 0.0)
             load_balance();
 
         print_loads(true, xbt_log_priority_debug);
@@ -140,7 +145,7 @@ void process::load_balance_loop()
         // send
         std::for_each(neigh.begin(), neigh.end(),
                       bind(&process::ctrl_send, this, _1));
-        prev_load_broadcast = get_load();
+        prev_load_broadcast = expected_load;
 
         sleep_until_date(next_iter_after_date, opt::min_lb_iter_duration);
         ctrl_receive(0.0);
@@ -252,6 +257,17 @@ bool process::still_running()
     return last_status;
 }
 
+double process::get_sum_of_to_send() const
+{
+    using std::tr1::bind;
+    using std::tr1::placeholders::_1;
+    using std::tr1::placeholders::_2;
+
+    return std::accumulate(neigh.begin(), neigh.end(), 0.0,
+                           bind(std::plus<double>(),
+                                _1, bind(&neighbor::get_to_send, _2)));
+}
+
 void process::load_balance()
 {
     if (lb_iter == 1)           // warn only once
@@ -260,14 +276,14 @@ void process::load_balance()
 
 void process::send(neighbor& nb, double amount)
 {
-    set_load(get_load() - amount);
+    expected_load -= amount;
     nb.set_to_send(nb.get_to_send() + amount);
     nb.set_load(nb.get_load() + amount);
 }
 
 void process::ctrl_send(neighbor& nb)
 {
-    double info_to_send = get_load();
+    double info_to_send = expected_load;
     if (info_to_send != prev_load_broadcast)
         comm.ctrl_send(nb.get_ctrl_mbox(),
                        new message(message::INFO, info_to_send));
@@ -286,23 +302,31 @@ void process::data_send(neighbor& nb)
 {
     double load_to_send;
     if (opt::bookkeeping) {
-        if (real_load <= nb.get_debt()) {
-            load_to_send = real_load;
+        load_to_send = std::min(real_load, nb.get_debt());
+        if (load_to_send >= opt::min_transfer_amount) {
             nb.set_debt(nb.get_debt() - load_to_send);
-            real_load = 0.0;
-        } else {
-            load_to_send = nb.get_debt();
-            nb.set_debt(0.0);
             real_load -= load_to_send;
+        } else {
+            load_to_send = 0.0;
         }
     } else {
         load_to_send = nb.get_to_send();
-        nb.set_to_send(0.0);
-        // do not update real_load here
+        if (load_to_send >= opt::min_transfer_amount) {
+            nb.set_to_send(0.0);
+            real_load -= load_to_send;
+        } else {
+            load_to_send = 0.0;
+        }
+    }
+    while (load_to_send > 0.0) {
+        double amount;
+        if (opt::max_transfer_amount)
+            amount = std::min(load_to_send, opt::max_transfer_amount);
+        else
+            amount = load_to_send;
+        comm.data_send(nb.get_data_mbox(), new message(message::LOAD, amount));
+        load_to_send -= amount;
     }
-    if (load_to_send > 0.0)
-        comm.data_send(nb.get_data_mbox(),
-                       new message(message::LOAD, load_to_send));
 }
 
 void process::ctrl_close(neighbor& nb)
@@ -344,7 +368,7 @@ void process::handle_message(message* msg, m_host_t from)
     switch (msg->get_type()) {
     case message::INFO: {
         neighbor* n = rev_neigh[from];
-        n->set_load(msg->get_amount());
+        n->set_load(msg->get_amount() + n->get_to_send());
         break;
     }
     case message::CREDIT: